DS4 G
LOSSARY
G-3
motor can deliver to a load and is usually specified
with a torque/speed curve.
Regeneration
The action during motor braking, in which the motor
acts as a generator and takes kinetic energy from the
load, converts it to electrical energy, and returns it to
the amplifier.
Repeatablity
The degree to which the positioning accuracy for a
given move performed repetitively can be duplicated.
Resolution
The smallest positioning increment that can be
achieved. Frequently defined as the number of steps
or feedback units required for a motor's shaft to rotate
one complete revolution.
Resolver
A position transducer utilizing magnetic coupling to
measure absolute shaft position over one revolution.
RMS Current
Root mean square current. In an intermittent duty
cycle application, the RMS current is equal to the
value of steady state current which would produce the
equivalent resistive heating over a long period of
time.
Rotor
The rotating part of a magnetic structure. In a motor,
the rotor is connected to the motor shaft.
Servo Amplifier/Servo Drive
An electronic device which produces the winding
current for a servo motor. The amplifier converts a
low level control signal into high voltage and current
levels top produce torque in the motor.
Servo System
An automatic feedback control system for mechanical
motion in which the controlled or output quantity is
position, velocity, or acceleration. Servo systems are
closed loop systems.
Shunt Resistor
A device located in a servo amplifier for controlling
regenerative energy generated when braking a motor.
This device dissipates of "dumps" the kinetic energy
as heat.
Single Point Ground
The common connection point for signal grounds in a
control wiring environment.
Slew
In motion control the portion of a move made at a
constant non-zero velocity.
Speed Regulation
For a speed control system, speed regulation is the
variation in actual speed expressed as a percentage of
set speed.
Stiffness
Ratio of an applied force torque to change in position
for a mechanical system.
Stator
The non-rotating part of a magnetic structure. In a
motor the stator usually contains the mounting
surface, bearings, and non-rotating windings or
permanent magnets.
Tachometer
An electromagnetic feedback transducer which
produces an analog voltage signal proportional to
rotational velocity. Tachometers can be either brush
or brushless.
Torque
The rotary equivalent to force. Equal to the product
of the force perpendicular to the radius of motion and
distance from the center of rotation to the point where
the force is applied.
Velocity
The change in position as a function of time.
Velocity has both a magnitude and direction.
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